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The Serva-Pak S is an extended surface high capacity air filter composed of individual dust holding pockets assembled in a metal support frame. Available in a variety of filter efficiencies, sizes and capacities, the Serva-Pak S allows maximum performance in given applications and is adaptable to a variety of frame and track systems. Purolator's unique process of fastening adjacent J-Channel frames incurs no media damage during assembly or shipment. Purolator uses a dual stage media in each Serva-Pak S filter. The first stage media is a prefilter consisting of coarse polyester fibers designed to arrest larger particulate in the airstream and enhance dirt loading capacity. The second stage media is a layer of microfine polypropylene fibers, spun-bonded and fastened to a polypropylene backing which captures the remaining smaller particles. The filter shall have an average efficiency of 65% when tested in accordance with ASHRAE std. 52.1-1992.